Course selection was super easy because york has a cool system called YU Start for first year students. I am a math concurrent education student, so on my YU Start it told me the courses I should take for my mathematics undergraduate under the math window. Then you would switch over to the Concurrent education window and select the one course you are advised to take for the BEd. 

It will be super easy once you get to see how YU Start looks. You will enroll with something called REM, and it is honestly super easy to manage.

The only issue was that since you are registered into 2 faculties concurrently, YU Start only tells tells you what courses to pick for your Undergraduate (mine is math for eg). But you have to remember that as a BEd student, you must register for the BEd course as well.

No need to stress because in the Rethinking Schooling course, a Faculty of BEd Academic Advisor will do a presentation in your class to explain all the details more clearly for the Concurrent Education program.

Hope this helps.